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VMM XACTOR
This base class is to be used as the basis for all transactors, including bus-functional models, monitors and generators. It provides a standard control mechanism expected to be found in all transactors.
virtual function void start_xactor();
Starts the execution threads in this transactor instance. This method is called by Environment class which is extended from vmm_env start() method.
virtual function void stop_xactor();
Stops the execution threads in this transactor instance. This method is called by Environment class which is extended from vmm_env stop() method.
protected task wait_if_stopped()
protected task wait_if_stopped_or_empty(vmm_channel chan)
Blocks the thread execution if the transactor has been stopped via the stop_xactor() method or if the specified input channel is currently empty.
protected virtual task main();
This task is forked off whenever the start_xactor() method is called. It is terminated whenever the reset_xactor() method is called. The functionality of a user-defined transactor must be implemented in this method.
Let us see an example of using vmm_xactor.
1) Extend vmm_xactor to create a custom_xtor.
class Driver extends vmm_xactor;
2) Define constructor. In this example, we don't have any interfaces of channels, we will not implement them.
Call the super.new() method.
function new();
super.new("Driver Transactor", "inst", 0);
endfunction: new
3) Define main() method.
First call the super.main() method.
Then define the activity which you want to do.
task main();
super.main();
forever begin
#100;
$display(" Driver : %d",$time);
end
endtask: main
Now we will see how to use the above defined Custom_xtor class.
1) Create a object of Custom_xtor.
Driver drvr = new();
2) Call the start_xactor() methods of Custom_xtor object.
Now the main() method which is defined starts gets executed.
#100 drvr.start_xactor();
3) Call the stop_xactor() methos.
This will stop the execution of main() method.
#1000 drvr.stop_xactor();
Complete Vmm_xactor Example
class Driver extends vmm_xactor;
function new();
super.new("Driver Transactor", "inst", 0);
endfunction: new
task main();
super.main();
forever begin
#100;
$display(" Driver : %d",$time);
end
endtask: main
endclass:Driver
program test();
Driver drvr = new();
initial
fork
#100 drvr.start_xactor();
#1000 drvr.stop_xactor();
join
endprogram
Download the files
vmm_xactor.tar
Browse the code in vmm_xactor.tar
Command to run the simulation
vcs -sverilog -f filelist -R -ntb_opts rvm -ntb_opts dtm
Log file report
Driver : 200
Driver : 300
Driver : 400
Driver : 500
Driver : 600
Driver : 700
Driver : 800
Driver : 900
Driver : 1000
$finish at simulation time 1000
Vmm_xactor Members
function new ( string name, string instance, int stream_id = -1 );
virtual function string get_name ( );
virtual function string get_instance ( );
vmm_log log;
int stream_id;
virtual function void prepend_callback ( vmm_xactor_callbacks cb );
virtual function void append_callback ( vmm_xactor_callbacks cb );
virtual function void unregister_callback ( vmm_xactor_callbacks cb );
vmm_notify notify;
// Enumeration values for the state of the transactor:
enum { XACTOR_IDLE, XACTOR_BUSY,
XACTOR_STARTED, XACTOR_STOPPED, XACTOR_RESET };
virtual function void start_xactor ( );
virtual function void stop_xactor ( );
virtual function void reset_xactor ( reset_e rst_typ = SOFT_RST );
protected task wait_if_stopped ( );
protected task wait_if_stopped_or_empty ( vmm_channel chan );
protected virtual task main ( );
virtual function void save_rng_state ( );
virtual function void restore_rng_state ( );
virtual function void xactor_status ( string prefix = "" );
// Macro to simplify the calling of callback methods:
`vmm_callback ( callback_class_name, method ( args ) )
This base class is to be used as the basis for all transactors, including bus-functional models, monitors and generators. It provides a standard control mechanism expected to be found in all transactors.
virtual function void start_xactor();Starts the execution threads in this transactor instance. This method is called by Environment class which is extended from vmm_env start() method.
virtual function void stop_xactor();Stops the execution threads in this transactor instance. This method is called by Environment class which is extended from vmm_env stop() method.
protected task wait_if_stopped()protected task wait_if_stopped_or_empty(vmm_channel chan)
Blocks the thread execution if the transactor has been stopped via the stop_xactor() method or if the specified input channel is currently empty.
protected virtual task main();This task is forked off whenever the start_xactor() method is called. It is terminated whenever the reset_xactor() method is called. The functionality of a user-defined transactor must be implemented in this method.
Let us see an example of using vmm_xactor.
1) Extend vmm_xactor to create a custom_xtor.
class Driver extends vmm_xactor;
2) Define constructor. In this example, we don't have any interfaces of channels, we will not implement them.
Call the super.new() method.
function new();
super.new("Driver Transactor", "inst", 0);
endfunction: new
3) Define main() method.
First call the super.main() method.
Then define the activity which you want to do.
task main();
super.main();
forever begin
#100;
$display(" Driver : %d",$time);
end
endtask: main
Now we will see how to use the above defined Custom_xtor class.
1) Create a object of Custom_xtor.
Driver drvr = new();
2) Call the start_xactor() methods of Custom_xtor object.
Now the main() method which is defined starts gets executed.
#100 drvr.start_xactor();
3) Call the stop_xactor() methos.
This will stop the execution of main() method.
#1000 drvr.stop_xactor();
Complete Vmm_xactor Example
class Driver extends vmm_xactor;
function new();
super.new("Driver Transactor", "inst", 0);
endfunction: new
task main();
super.main();
forever begin
#100;
$display(" Driver : %d",$time);
end
endtask: main
endclass:Driver
program test();
Driver drvr = new();
initial
fork
#100 drvr.start_xactor();
#1000 drvr.stop_xactor();
join
endprogram
Download the files
vmm_xactor.tar
Browse the code in vmm_xactor.tar
Command to run the simulation
vcs -sverilog -f filelist -R -ntb_opts rvm -ntb_opts dtm
Log file report
Driver : 200
Driver : 300
Driver : 400
Driver : 500
Driver : 600
Driver : 700
Driver : 800
Driver : 900
Driver : 1000
$finish at simulation time 1000
Vmm_xactor Members
function new ( string name, string instance, int stream_id = -1 );
virtual function string get_name ( );
virtual function string get_instance ( );
vmm_log log;
int stream_id;
virtual function void prepend_callback ( vmm_xactor_callbacks cb );
virtual function void append_callback ( vmm_xactor_callbacks cb );
virtual function void unregister_callback ( vmm_xactor_callbacks cb );
vmm_notify notify;
// Enumeration values for the state of the transactor:
enum { XACTOR_IDLE, XACTOR_BUSY,
XACTOR_STARTED, XACTOR_STOPPED, XACTOR_RESET };
virtual function void start_xactor ( );
virtual function void stop_xactor ( );
virtual function void reset_xactor ( reset_e rst_typ = SOFT_RST );
protected task wait_if_stopped ( );
protected task wait_if_stopped_or_empty ( vmm_channel chan );
protected virtual task main ( );
virtual function void save_rng_state ( );
virtual function void restore_rng_state ( );
virtual function void xactor_status ( string prefix = "" );
// Macro to simplify the calling of callback methods:
`vmm_callback ( callback_class_name, method ( args ) )
Index
Introduction
Vmm Log
Vmm Env
Vmm Data
Vmm Channel
Vmm Atomic Generator
Vmm Xactor
Vmm Callback
Vmm Test
Vmm Channel Record And Playback
Vmm Scenario Generator
Vmm Opts
Report a Bug or Comment on This section - Your input is what keeps Testbench.in improving with time!
Introduction
Vmm Log
Vmm Env
Vmm Data
Vmm Channel
Vmm Atomic Generator
Vmm Xactor
Vmm Callback
Vmm Test
Vmm Channel Record And Playback
Vmm Scenario Generator
Vmm Opts
Report a Bug or Comment on This section - Your input is what keeps Testbench.in improving with time!